Ecmweb 4225 102ecmicpic4
Ecmweb 4225 102ecmicpic4
Ecmweb 4225 102ecmicpic4
Ecmweb 4225 102ecmicpic4
Ecmweb 4225 102ecmicpic4

Illustrated Catastrophes, February 2011

Feb. 23, 2011
As usual, never consider the following commentary associated with these photos as a formal interpretation of the National Electrical Code (NEC). Without criticizing anyone or any product, the following scenarios present us with serious safety questions.

Indoor/Outdoor Use Not Recommended


If this equipment was good enough for indoor use, someone must have decided why not place it outdoors as well. Big mistake! It’s obvious this junction box and EMT coupling and connector are not designed to be used outdoors in wet locations.

This basic junction box was used to connect a new underground nonmetallic conduit and new electrical metallic tubing (EMT). The EMT and box were mounted on the side of the building adjacent to a driveway and exposed to the outdoor elements. It appears the hole in the side of the box was made with a hole saw that was slightly larger than the EMT fitting. To close the gap, the installer first sealed it up with silicone and then wrapped some plastic around it.

Not only does this installation violate the listing and labeling requirement of this equipment, as per 110.3(B), but it also violates the grounding and bonding requirements of 250.118.

As noted in 358.10(C), “All supports, bolts, straps, screws, and so forth shall be of corrosion-resistant materials or protected against corrosion by corrosion-resistant materials.” An informational note after this text steers you to Sec.300.6 for details on protection against corrosion.

Section 358.42 addresses the use of EMT couplings and connectors. The last sentence in this section states, “Where installed in wet locations, they shall comply with 314.15.” Article 314 addresses outlet, device, pull, and junction boxes; conduit bodies; fittings; and handhole enclosures. Section 314.15 states, “In damp or wet locations, boxes, conduit bodies, and fittings shall be placed or equipped so as to prevent moisture from entering or accumulating within the box, conduit body, or fitting. Boxes, conduit bodies, and fittings installed in wet locations shall be listed for use in wet locations.”

About the Author

Joe Tedesco

Tedesco served the industry in many roles during his career. He was a director, senior electrical code instructor for National Technology Transfer, Inc. and American Trainco, Inc.. He was also a codes, standards and seminar specialist for the International Association of Electrical Inspectors and an electrical field service specialist for the National Fire Protection Association in Quincy, Mass. He ran his own business as an NEC consultant and is a Massachusetts licensed master electrician and journeyman electrician and certified electrical inspector (one and two family 2A; General 2B, and Plan Review, 2C). Tedesco also wrote articles for CEE News and EC&M (Code Violations Illustrated and What's Wrong Here?) for more than 15 years and helped launched the Moving Violations video series.

Voice your opinion!

To join the conversation, and become an exclusive member of EC&M, create an account today!

Sponsored Recommendations

Electrical Conduit Comparison Chart

CHAMPION FIBERGLASS electrical conduit is a lightweight, durable option that provides lasting savings when compared to other materials. Compare electrical conduit types including...

Don't Let Burn-Through Threaten Another Data Center or Utility Project

Get the No Burn-Through Elbow eGuide to learn many reasons why Champion Fiberglass elbows will enhance your data center and utility projects today.

Considerations for Direct Burial Conduit

Installation type plays a key role in the type of conduit selected for electrical systems in industrial construction projects. Above ground, below ground, direct buried, encased...

How to Calculate Labor Costs

Most important to accurately estimating labor costs is knowing the approximate hours required for project completion. Learn how to calculate electrical labor cost.